RV37H7: Crystal group of very splendent luster and excellent color formed by the cube and the octahedron and partially covered by Calcite. Because it was found long ago and still possesses its original luster, we think it can be maintained indefinitely if the sample is protected from sun light.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (±1969)

Specimen size: 3.2 × 2.3 × 1.5 cm = 1.26” × 0.91” × 0.59”

Main crystal size: 0.5 × 0.5 cm = 0.20” × 0.20”